When scrolling text, how to tell when the end is reached

[rosscanning]

I'm rendering a Paragraph widget with a wall of text. I process the PageUp and PageDown keys to set the 'scroll' of the widget, so the user can scroll up and down. Works nicely.

Problem is, how can I tell when the user has reached the bottom of the text? I would like to disable PageDown at that point, so the user can't keep scrolling down into blankness.

Poking around in the code, it seems like Paragraph::render() has the info I need. If I knew how this rendering loop:

tui-rs/src/widgets/paragraph.rs

Line 175 in a6b25a4

while let Some((current_line, current_line_width)) = line_composer.next_line() {

exited (i.e., it ran out of lines or breaked out) I would know whether to enable PageDown or not. But this info is not exposed anywhere.

Ideally, render() would return this information, but that's far too big a change. My vague plan to fix this is to add a 'last_render_result' field to Paragraph, that tells you how the most recent render ended. Does that sound like something that you might accept?